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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Leased Assets [Line Items]    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 151 $ 144
Sublease rental income 91 $ 85
Future minimum lease commitments    
2021 391  
2022 434  
2023 422  
2024 314  
2025 278  
Thereafter 530  
Total $ 2,369  
Minimum    
Operating Leased Assets [Line Items]    
Sublease, term of contract (in years) 3 years  
Maximum    
Operating Leased Assets [Line Items]    
Sublease, term of contract (in years) 11 years